I hope for your sake that when the factory workers can't afford to feed their kids and they drag you from your home and try to beat you to death in front of your family they find that argument compelling.
I’m surprised Oreo hasn’t done a Halloween ad campaign about how people eat their cookies: Hold it under until the bubbles stop, twist its head off, eat it in tiny nibbles.
It does phone home, but with the right DNS settings you can block that. Heck, if you're just going to localhost you can disconnect the machine from the network entirely.
Unless something's changed recently, you can just install the Chromium browser itself. And it looks like it's available as a Flatpak. As a bonus this will eliminate anything extra added by browser manufacturers as a potential problem.
I've seen it, too. When I want fluffy individual grains, I rinse the rice first. If I want sticky rice, I don't rinse it. And it works for all different kinds of rice.
There's going to be powdered starch on the outside of the grains of rice. If you rinsed it and then added something like corn starch to the water you'd end up with sticky rice.